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Sweet Potato Response to K and P Fertilization 1
Author(s) -
Nicholaides J. J.,
Chancy H. F.,
Mascagni H. J.,
Wilson L. G.,
Eaddy D. W.
Publication year - 1985
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1985.00021962007700030024x
Subject(s) - ipomoea , yield (engineering) , human fertilization , chemistry , potassium , phosphorus , agronomy , potassium sulfate , nutrient , zoology , horticulture , biology , materials science , organic chemistry , metallurgy
Limited literature is available to provide recommendations of K source and rate and P rate for sweet potato [ Ipomoea batatas (L.) Lam.] production. Many growers, therefore, continue to use the more expensive sulfate (SO 4 ) source of K rather than chloride (Cl) and higher than recommended rates of K and P. Accordingly, on‐farm experiments were conducted during 3 years on North Carolina Paleudults to determine effects of K source and rate and Prate on sweet potato yield, grade, and quality. Potassium sources were KCl and K 2 S0 4 . Fertilization rates of K varied over the five K experiments and depended on initial soil test levels which ranged from 0.04 to 0.12 cmol K L −1 by Mehlich‐I extractant. In the three P experiments, the various P rates were also dependent upon the initial soil test levels which ranged from 11 to 30 mg P L −1 also by Mehlich‐I extractant. As K source had no effect on yield, grade, or quality, it was concluded that the higher Cl concentrations, up to 22.8 g kg −1 , in vegetative tissue with increasing KCl rates had no detrimental effect on sweet potato yield, grade, or quality. Total yield response to K applications was obtained where soil test K levels were ≤ 0.08 cmol L −1 , although no. 1 yields increased only where soil test K levels were ≤ 0.05 cmol L −1 . Phosphorus applications had no effect on yield, grade, or quality of sweet potato.